Power steering whining noise

These are the classic symptoms of a worn power steering pump. Specifically, the fiber vanes have worn down so the fluid can bypass them without being forced out under pressure. The first clue is the pressure comes back when raising engine speed. The pump's volume is increased enough that it pumps more than that which is leaking past the vanes. The second clue is the power assist does work under the right conditions. That proves the steering gear is not leaking internally or binding.

Here's links to some related articles:

https://www.2carpros.com/articles/power-steering-problems

https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump

https://www.2carpros.com/articles/remove-reinstall-power-steering-pulley

Due to the design, Ford often requires the pulley be removed from the power steering pump to remove the pump. Also be aware it can be very frustrating getting the air burped out of the system. There are a number of special tools made just for Ford products to help with this. One is a tall funnel that clips to the reservoir. While running, the pressurized fluid squeezes the air trapped in the system so it can't work its way out. A common complaint is as soon as the engine is stopped, a giant blop of fluid jumps out of the reservoir. That is caused by the air expanding, pushing the fluid out. This special funnel catches that fluid and directs it back into the reservoir. There are also vacuum pumps that cause the trapped air to expand and come out easier.

Cardiodoc!
Hello again. I'm pretty sure you are the person that helped me a several times, for quite a few different problems. That is when i was driving a 1990 Dakota 3.9l, that drove me Insane. I'm glad you replied to my question on my, new to me truck, lol. A 2012 F350 SD, which is a bit of an upgrade LOL. Just wanted to say, Thank you sir. As i said before I flushed power st system and refilled HA. The first link you sent showed me that i didn't flush it properly. Going to start with that tom and go from there. I will let you know how it goes.

Bobby

Cardiodoc.
I just flushed power steering pump again. As shown in the video, and i defiantly didn't do as good job first time as second time. Fluid looked 100% better after. Bout to test drive shortly. Will let ya know how it turns out..

Bobby

I'll keep my fingers crossed, but power steering fluid doesn't have additives that wear out like they do in engine oil and antifreeze. The initial clue was the return of power assist when engine speed is raised a little. That points to worn vanes in the impeller.

Hey cardiodoc, it definitely did help some. The whining noise is almost completely gone an truck does turn a little better. But alas i think your right. Pretty sure i just stuck a band aid on it. Lol. Looks like I'll be calling around to find a new power steering pump. Lol. I'll let ya know.

When you get the pump, ask if they have any special tools to help with bleeding the air out of the system. If that is a common problem on your model, they will have heard complaints in the past from people blaming it on the new pump. The parts people also get a lot of training related to the problems their parts are designed to solve, and as such, they may know some of the best tricks for bleeding the air out.

Thank you sir. I again appreciate the help/information. And i will let ya know how it goes when i get the new pump.

Please let us know what you find. We are interested to see what it is.

Yes sir Ken, I'm hoping to have the new pump Friday, Saturday. I will definitely let you know if that corrects the problem or not. I do greatly appreciate all the help/info from you guys. This is by far the best place I've found for information to any car/truck problem I've had since signing up. I will post updates when part comes in.